OPA2172 - 36V 10MHz Dual Rail-to-Rail Op Amp | Texas Instruments
MPN: OPA2172 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.55 | $1.55 |
| 10 | $1.4 | $14.00 |
| 100 | $1.22 | $122.00 |
| 500 | $1.05 | $525.00 |
| 1,000 | $0.92 | $920.00 |
OPA2172 Overview
An operational amplifier (op amp) is a high-gain differential voltage amplifier used as the building block of analog signal chains - a subcategory of amplifier ICs within the broader power-management and signal-conditioning hierarchy. The OPA2172 belongs to TI's OPAx172 family (OPA172 single, OPA2172 dual, OPA4172 quad), which is engineered for high-voltage, single-supply designs where the output must swing close to the rails.
Key features include a gain-bandwidth product of 10 MHz, low input offset voltage of ±0.2 mV, and ultra-low offset drift of ±0.3 uV/degC, ensuring accuracy across the industrial temperature range. Input bias current is a low ±8 pA thanks to the JFET-input front end, and broadband noise is 7 nV/rtHz, making the part suitable for precision, low-noise signal conditioning. High slew rate supports fast settling in active filters and ADC drivers.
Architecturally, the OPA2172 uses a precision input stage with rail-to-rail output stage that maintains low distortion even when driving loads near the supply rails. The 36-V tolerance provides headroom against industrial 24-V bus transients, and operation down to +4.5 V supports 5-V single-supply systems.
Typical applications include 24-V industrial instrumentation front ends, active filter and data-acquisition signal conditioning ahead of ADCs such as the ADS131M08, sensor buffering, and output amplification in audio and synth-DIY circuits where it replaces noisier TL072-class devices.
Design tip: keep total supply below 36 V, and for maximum output swing at low loads, ensure load impedance keeps output current within datasheet limits; bypass both supply pins with 100 nF ceramics placed close to the device.
Drop-in alternatives for OPA2172 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with OPA2172 (same form factor and footprint) — differing in Package, Input Offset Voltage, Input Bias Current, Input Voltage Noise, Quiescent Current.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
OPA2172-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
OPA2192IDR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.82 / Unit
View Datasheet →OPA2375IPWR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.62 / Unit
View Datasheet →OPA1688ID
✅ Drop-In✓ In Stock
$0.82 / Unit
View Datasheet →AD8221ARZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.29 / Unit
View Datasheet →OPA2172 Maximum Ratings & Electrical Characteristics
| Amplifier Channels | 2 (Dual) |
| Supply Voltage Range | +4.5 V to +36 V, ±2.25 V to ±18 V |
| Gain Bandwidth Product | 10 MHz |
| Input Offset Voltage | ±0.2 mV |
| Offset Voltage Drift | ±0.3 uV/degC |
| Input Bias Current | ±8 pA |
| Input Voltage Noise | 7 nV/rtHz |
| Quiescent Current per Amplifier | 1.6 mA |
| Output Type | Rail-to-Rail Output (RRO) |
| Operating Temperature | -40C to +125C |
| Package | 8-SOIC (D) |
| Mounting Type | Surface Mount |
| Unit Count | Standard (General Purpose) Amplifier |
| Family | OPAx172 (OPA172 / OPA2172 / OPA4172) |
| RoHS Status | Compliant |
| Single Supply Operation | Yes |
OPA2172 Pin Configuration
| Pin 1 | OUT A — Output of amplifier A (rail-to-rail) |
| Pin 2 | IN A- — Inverting input of amplifier A |
| Pin 3 | IN A+ — Non-inverting input of amplifier A |
| Pin 4 | V- — Negative supply (or GND on single supply) |
| Pin 5 | IN B+ — Non-inverting input of amplifier B |
| Pin 6 | IN B- — Inverting input of amplifier B |
| Pin 7 | OUT B — Output of amplifier B (rail-to-rail) |
| Pin 8 | V+ — Positive supply, up to +36 V |
Typical Applications
OPA2172 is suitable for 6 applications: Industrial 24-V Instrumentation Front Ends, Data Acquisition and ADC Driver, Audio and Synthesizer Signal Path, Active Filter and Signal Conditioning, Sensor Buffering and Transimpedance Front Ends, Automotive Signal Conditioning (OPA2172-Q1 path).
Industrial 24-V Instrumentation Front Ends
The OPA2172's 36-V supply tolerance gives direct headroom on 24-V industrial rails where transients push nodes above nominal, eliminating extra supply conditioning stages. Its ±0.2 mV offset and ±0.3 uV/degC drift preserve accuracy in sensor signal conditioning over -40C to +125C operation. Typically configured as a differential or non-inverting gain stage ahead of a precision ADC, the 10-MHz GBW supports gains of 10 to 100 with adequate closed-loop bandwidth, and the rail-to-rail output maximizes dynamic range into the converter. Bypass each supply pin with 100-nF ceramics for best noise performance.
Recommended
Data Acquisition and ADC Driver
Ahead of 16- to 24-bit ADCs, the OPA2172 works as a low-noise buffer or gain stage: 7 nV/rtHz input noise and ±8 pA bias current prevent error terms from dominating high-impedance sources. The rail-to-rail output stage swings close to the rails, maximizing converter input range on 5-V single supplies, while 10-MHz GBW ensures fast settling for multiplexed inputs. Place the OPA2172 close to the ADC input with an RC filter sized for the converter's switched-capacitor charge kickback; the amp's output stage handles the transient load without significant distortion.
Recommended
Audio and Synthesizer Signal Path
In audio preamps, line drivers, and modular-synth output stages, the OPA2172 replaces TL072-class parts with 7 nV/rtHz noise and far lower offset and drift, reducing hiss and DC offsets in the signal path. TI E2E forum analysis of headphone-buffer duty (vs the OPA1688 into 32-ohm loads) confirms solid output behavior, and the 36-V operation supports ±15-V pro-audio rails directly. Its dual configuration covers a complete input-plus-output channel per package, and the SOIC-8 pinout allows drop-in upgrade of existing TL072 sockets with no layout change.
Recommended
Active Filter and Signal Conditioning
The OPA2172's 10-MHz gain-bandwidth product and high slew rate make it well suited to Sallen-Key and multiple-feedback active filters in anti-aliasing and noise-limiting roles. Because filter accuracy depends on amplifier bandwidth being many times the corner frequency, the 10-MHz GBW keeps gain and phase errors small for filters up to hundreds of kilohertz at moderate Q. The rail-to-rail output prevents clipping near the rails when the filter output approaches supply limits, and low offset drift keeps DC transfer points stable over temperature in industrial environments.
Recommended
Sensor Buffering and Transimpedance Front Ends
With ±8 pA input bias current from its high-impedance input stage, the OPA2172 buffers pH probes, piezoelectric sensors, photodiodes, and other high-impedance sources without loading error. The low 7 nV/rtHz voltage noise matters when the source impedance converts current noise into voltage noise, making the device a good fit for moderate-bandwidth transimpedance amplifiers. Its rail-to-rail output preserves small signal swings near ground on single-supply systems, and the 36-V rating allows direct operation from industrial supply rails without level-shifting circuitry.
Recommended
Automotive Signal Conditioning (OPA2172-Q1 path)
For automotive modules conditioning sensor signals on 12-V or load-dump-hardened rails, the AEC-Q100-qualified OPA2172-Q1 provides identical 36-V, 10-MHz performance with automotive screening and PPAP support. Common uses include conditioning of pressure, position, and current-sense signals ahead of MCU ADC inputs, where the rail-to-rail output maximizes converter range and the low offset drift maintains calibration over the full -40C to +125C ambient range. The dual-channel package reduces BOM count by integrating two channels in one SOIC-8 footprint.
Recommended
Recommended Products Summary
Engineering reference data for OPA2172 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OPA2172-Q1 | OPA2192IDR | OPA1688 | AD822 |
|---|---|---|---|---|---|
| Package | 8-SOIC (D) | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Max Supply Voltage | 36 V | 36 V | 36 V | 36 V | 36 V |
| Automotive Grade | No | Yes (AEC-Q100) | No | No | No |
| Output Type | Rail-to-Rail Output | Rail-to-Rail Output | Rail-to-Rail Input and Output | Rail-to-Rail Output | Rail-to-Rail Output |
Key Differentiators
- 36-V supply tolerance for 24-V rail headroom (vs AD822)
- Ultra-low offset drift (vs TL072-class parts)
- Precision upgrade path (vs OPA2192IDR)
Design Notes
Keep total supply across V+ to V- at or below 36 V at all times, including transients - the OPA2172's 36-V rating is an absolute maximum parameter basis for designs riding 24-V industrial rails. Bypass V+ (pin 8) and V- (pin 4) each with a 100-nF X7R ceramic placed within 2-3 mm of the pins, plus one bulk 1-10 uF capacitor per supply rail. On single-supply 5-V systems, verify the input common-mode range before configuring high-gain non-inverting stages.
Keep the feedback path short and direct around each amplifier; long feedback traces add parasitic capacitance that degrades phase margin at the 10-MHz GBW. Route high-impedance input traces (IN A+, IN B+) away from output traces to prevent capacitive coupling and unintended feedback. Use a solid ground plane beneath the SOIC-8; add a small series resistor (10-50 ohm) or R-C snubber at the output when driving long cables or capacitive loads above ~100 pF to avoid oscillation.
The OPA2172 is rail-to-rail on the output only, not the input - do not assume input operation all the way to the positive rail; consult the input common-mode range in the OPAx172 datasheet (Rev. H) when sensing near V+. Also, when replacing a TL072 in legacy layouts, note the OPA2172 drives loads closer to the rails, which can change bias points in circuits relying on TL072 headroom behavior. For automotive qualification requirements, specify OPA2172-Q1, not the standard grade.
Compliance Information
RoHS compliant per TI product page; standard OPA2172 is not AEC-Q100 qualified - use OPA2172-Q1 for automotive.
